Preamble Detection

[BismaAmjad]

Hi, Thanks for compiling an amazing book on understanding the ADSB signal architecture and its decoding procedure. The book is pretty comprehensive, however, I couldn't find the preamble detection method used to identify an ADS-B signal. I want to know exactly:

• how the raw received data is first converted into binary
• how to implement preamble detection, before the adsb message could be decoded.

Any help will be highly appreciated.

Thanks Bisma

[junzis]

This will be in a new version of the book, which should be available soon.

For those who are interested now. Here is an implementation in pyModeS: https://github.com/junzis/pyModeS/blob/master/pyModeS/extra/rtlreader.py